Carton



S. E. BUTLER CARTON Filed July 15. 1925 Patented Aug. 10, 1926,

UNITED STATES" \SILAS vBUTL R, or ronnno, oHIo.

PATENTT oFFic-E.

CARTON.

Application filed iuly 15, 1925. Serial N0. 43,673.

a simple and inexpensive device for holding the end flaps of a cartoninfolded-position; and to provide frictional means associated with theend'flaps for preventing unfolding thereof.

The invention is shown for purposes of illustration in the accompanyingdrawings in.

Fig. 1 is a side elevation of the carton with the flaps in unfolded orextended position; Fig 2 is asection on the line 22 of Fig. 1; Fig. 3 isa perspective view of the carton; and Fig. 4 is an end view of thecarton with the side closure flaps in folded position.

The illustrated embodiment of the invention comprises a carton havingside panels 1, 2, 3 and 4 and the panel 2 is provided with a marginalextension 5 which is folded inwardly and is adhesively attached to theinside of the panel 3. Formed on the opposite ends of the panel 1 areside closure flaps 6 and 7 which correspond respectively with the sideclosure flaps 8 and 9 on the ends of the panel 3. On one end of thepanel 2 is an end closure flap 10 having a transversely foldableinsertion lip 11, and at the opposite end of the carton an end closureflap 12 is provided on the panel 4 and terminates at its outer end in afoldable insertion lip 13. 1

It has been found in the sealing of cartons of the above character thatthe end panels do not remain in folded position, and this isparticularly true in the case of a flap such as 12 which is away fromthe adhesively connected extension 5. The reason for such unwarrantedunfolding is especially because the extension 5 is not always fastenedto the panel 3 in such a manner that a comparatively small space isprovided between the edge of the side flap 8 and the panel 2. If thespace therebetween is relatively large, then there is not a sulficientfrictional binding action to hold the end closure flap 12 in foldedrelation, in

other words a variable opening is formed according to the sealingoperation of the sealing machine. It will be apparent that this problemis not present as regards the end flap 10 because the panels 1, 2 and 4are of one piece and this flap is connected to the panel 2 in the regionof the extension 5.

In order to overcome the'above'objection and effect a reliable holdingof the flap 12 in folded position,-an extension tip- 14 is provided onthemarginal extension 5', preferably integral therewith. As shown, thetip 14 may be pointed with outer edge tapering inwardly and isadhesively secured to the inner face of the side flap 8. It will beapparent that when the Ham .8 and 6 are folded together the space forreceiving the foldable lip 13 is constant irrespective of theirregularity in the sealing of the marginal extension 5. This space issufficient to bind the lip 13 frictionally in place so that accidentalunfolding is prevented. To facilitate the insertion of the lip 13, anotch 15 may be out out of the flap 8 although this is optional and isnot essential in every instance.

While I have shown and described a con struction which is the best formknown to me at the present time it is tobe understood that numerouschanges in details of construction and arrangement may be effectedwithout departing from the spirit of the invention, especially asdefined in the appended claims.

What I claim as new and desire to secure by Letters Patent, is

1. A carton formed from a one-piece blank providing when folded aplurality of side walls, a marginal extension on one wall adhesivelyconnected to the inside of an adjacent side wall, oppositely positionedside closure flaps, and an end flap, a foldable lip on said end flap,and an extension strip on said marginal extension attached to the insideof the adjacent side closure flap whereby when inserted inside thecarton said lip frictionally engages said strip to prevent accidentalunfolding of the end flap.

2. A carton having four sides foldably connected together, and a sealingstrip at the outer edge of one side adapted to marginally lap and besealed to the adjacent edge of an-adjoining side, side flaps hingedlysecured to the ends of opposite sides, end closure flaps hinged toopposite ends of opposed sides other than the sides to which the sideflaps are secured and each having an in-' sertion tongue at its freeend, the insertion tongues adapted to be inserted into the body of thecarton between a side of the carton and edges of the adjacent sideflaps, and a tapered extension on one end of the sealing strip foldabletransversely With respect to the carton body and adapted to cooperateWith the adjoining carton side to form a space for the insertion of theadjacent end closure lip, which space before and after the shaping ofthe carton is constant in size for the insertion of the lip.

8. A one-piece. carton having four sides, aniarginal extension on oneside overlapping and adhesively connected to an adjacent side, sideflaps foldably connected to opposite sides, an end flap on the sideopposite from the side provided With said mar ginal extension, aninsertion lip on said end flap, and an extension tip on said extensionadhesively connected to an adjacent side flap whereby When folded saidextension tip engages said lip for holding the latter in foldedrelation.

4i. A one-piece carton having four sides, a marginal extension on oneside overlapping and adhesively connected to an adjacent'side, sideflaps foldably connected to opposite sides, an end flap on the side.opposite from the side provided With a marginal extension, and aninsertion lip on said end flap, and an extension tip on said marginalextension overlapping an adjacent side flap, said tip having an inclinedouter edge to cooperate With that side having said marginal extensionfor holding said insertion lip in folded relation.

ln testimony whereof, I have hereunto signed my name to thisspecification SILAS E; BUTLiEi-t.

